Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/WstWriter.java @ 4128:11c589d68f13

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Fix for NPE in FLYSWorkspace.bringUp() #933
author Christian Lins <christian.lins@intevation.de>
date Sun, 14 Oct 2012 10:15:50 +0200
parents d9af29a4bb85
children
rev   line source
446
c0bec245f608 Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those.
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1 package de.intevation.flys.exports;
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2
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3 import java.io.BufferedWriter;
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4 import java.io.OutputStream;
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5 import java.io.OutputStreamWriter;
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6 import java.io.PrintWriter;
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7
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8 import java.util.ArrayList;
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9 import java.util.Collection;
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10 import java.util.HashMap;
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11 import java.util.List;
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12 import java.util.Locale;
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13 import java.util.Map;
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14 import java.util.TreeMap;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import de.intevation.flys.artifacts.model.WstLine;
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19
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20
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21 /**
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22 * A writer that creates WSTs.
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23 *
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24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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25 */
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26 public class WstWriter {
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27
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28 /** The logger used in this class. */
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29 private static Logger logger = Logger.getLogger(WstWriter.class);
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30
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31 /** The default unit that is written into the header of the WST. */
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32 public static final String DEFAULT_UNIT = "Wassserstand [NN + m]";
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33
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34 /** The lines that need to be included for the export. */
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35 protected Map<Double, WstLine> lines;
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36
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37 /** The column names. */
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38 protected List<String> columnNames;
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39
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40 /** The locale used to format the values. */
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41 protected Locale locale;
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42
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43 /** The number of discharge columns. */
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44 protected int cols;
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45
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46 /** The last Q values. */
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47 protected double[] qs;
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48
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49
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50
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51 /**
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52 * This constructor creates a new WstWriter with a number of Q columns.
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53 *
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54 * @param cols The number of columns of the resulting WST.
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55 */
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56 public WstWriter(int cols) {
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57 this.columnNames = new ArrayList<String>(cols);
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58 this.lines = new HashMap<Double, WstLine>();
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59 this.qs = new double[cols];
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60 this.locale = Locale.US;
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61 }
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62
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63
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64 /**
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65 * This method is used to create the WST from the data that has been
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66 * inserted using add(double[]) before.
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67 * @param out Where to write to.
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68 */
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69 public void write(OutputStream out) {
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70 logger.info("WstWriter.write");
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71
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72 PrintWriter writer = new PrintWriter(
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73 new BufferedWriter(
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74 new OutputStreamWriter(out)));
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75
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76 this.qs = new double[cols];
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77
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78 writeHeader(writer);
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79
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80 Collection<WstLine> collection = new TreeMap(lines).values();
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81
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82 for (WstLine line: collection) {
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83 writeWLine(writer, line);
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84 }
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85
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86 writer.flush();
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87 writer.close();
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88 }
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91 /**
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92 * This method is used to add a new line to the WST.
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93 *
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94 * @param wqkms A 3dim double array with [W,Q, KM].
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95 */
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96 public void add(double[] wqkms) {
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97 Double km = wqkms[2];
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98
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99 WstLine line = lines.get(km);
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100
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101 if (line == null) {
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102 line = new WstLine(km.doubleValue());
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103 lines.put(km, line);
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104 }
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105
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106 line.add(wqkms[0], wqkms[1]);
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107 }
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108
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109
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110 public void addCorrected(double[] wqckms) {
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111 Double km = wqckms[2];
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112
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113 WstLine line = lines.get(km);
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114
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115 if (line == null) {
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116 line = new WstLine(km.doubleValue());
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117 lines.put(km, line);
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118 }
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119
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120 line.add(wqckms[3], wqckms[1]);
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121 }
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122
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123
446
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124 /**
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125 * Adds a further column name.
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126 *
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127 * @param name The name of the new column.
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128 */
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129 public void addColumn(String name) {
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130 if (name != null) {
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131 cols++;
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132
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133 String basename = name;
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134
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135 int i = 0;
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136 while (columnNames.contains(name)) {
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137 name = basename + "_" + i++;
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138
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139 if (name.length() > 9) {
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140 name = name.substring(name.length() - 9);
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141 }
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142 }
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143
447
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144 columnNames.add(name);
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145 }
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146 }
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147
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148
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149 /**
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150 * This method writes the header of the WST.
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151 *
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152 * @param writer The PrintWriter that creates the output.
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153 */
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154 protected void writeHeader(PrintWriter writer) {
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155 logger.debug("WstWriter.writeHeader");
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156
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157 writer.println(cols);
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158 writer.print(" ");
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159
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160 for (String columnName: columnNames) {
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161 writer.printf(locale, "%9s", columnName);
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162 }
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163
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164 writer.println();
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165
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166 writer.write("* KM ");
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167 writer.write(DEFAULT_UNIT);
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168 writer.println();
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169 }
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170
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171
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172 /**
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173 * This method writes a line with W values and a certain kilometer.
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174 *
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175 * @param writer The PrintWriter that is used to create the output.
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176 * @param line The WstLine that should be written to the output.
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177 */
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178 protected void writeWLine(PrintWriter writer, WstLine line) {
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179 double km = line.getKm();
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180 double[] qs = line.getQs();
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181 int num = line.getSize();
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182
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183 if (dischargesChanged(qs)) {
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184 writeQLine(writer, qs);
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185 }
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186
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187 writer.printf(locale, "%8.3f", km);
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188
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189 for (int i = 0; i < num; i++) {
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190 writer.printf(locale, "%9.2f", line.getW(i));
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191 }
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192
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193 writer.println();
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194 }
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195
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196
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197 /**
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198 * Writes a discharge line (Q values) into a WST.
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199 *
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200 * @param qs the Q values for the next range.
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201 */
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202 protected void writeQLine(PrintWriter writer, double[] qs) {
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203 writer.write("*\u001f ");
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204
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205 for (int i = 0; i < qs.length; i++) {
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206 this.qs[i] = qs[i];
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207
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208 writer.printf(locale, "%9.2f", qs[i]);
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209 }
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210
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211 writer.println();
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212 }
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213
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214
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215 /**
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216 * This method determines if a Q has changed from the last line to the
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217 * current one.
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218 *
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219 * @param newQs The Q values of the next line.
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220 *
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221 * @return true, if a Q value have changed, otherwise false.
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222 */
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223 protected boolean dischargesChanged(double[] newQs) {
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224 // XXX maybe there is a way to do this faster
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225 for (int i = 0; i < cols; i++) {
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226 if (Math.abs(newQs[i] - qs[i]) >= 0.001) {
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227 return true;
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228 }
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229 }
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230
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231 return false;
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232 }
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233 }
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234 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org